PDF malware analysis — malicious · aabcdf50413a5b34

MALICIOUS

PDF

42.6 KB Created: 2020-08-16 01:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fb4c186a6287ebefc722b00064c9397e SHA-1: e26e4e0f726e65a67cc9bb15834a9384d3e478ed SHA-256: aabcdf50413a5b344b021280c924ff46f6d99f22f5106c83d05feb81131ac08c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a malicious link disguised as a 'Vim cheat sheet github' which redirects to a known malicious redirector. The document body is heavily obfuscated but contains the same redirect URL. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to increase visibility. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.cc/pify?keyword=vim+cheat+sheet+github
- http://files.cldlab.com/uploads/1/3/0/8/130814205/8c0eb86d2.pdf
- http://files.williamsburgnaz.org/uploads/1/3/0/7/130776204/6505338.pdf
- https://cdn.shopify.com/s/files/1/0441/4029/8392/files/ventral_hernia_patient_information.pdf
- https://cdn.shopify.com/s/files/1/0428/0470/7491/files/buzusalepimu.pdf
- https://cdn.shopify.com/s/files/1/0432/2168/0283/files/tolelomaladizoke.pdf
- https://cdn.shopify.com/s/files/1/0428/8000/8355/files/begelajitelafejuv.pdf
- https://cdn.shopify.com/s/files/1/0429/0668/1497/files/introduction_to_binary_system.pdf
- https://cdn.shopify.com/s/files/1/0431/1754/3588/files/3830296394.pdf
- https://cdn.shopify.com/s/files/1/0429/8774/9525/files/webojitomuxeboxa.pdf
- https://cdn.shopify.com/s/files/1/0428/5107/4204/files/patisise.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005357.bin` `17aeeb4bea776b867c57838842086098ba6e2a6755657966461c75ad04ee5f7e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5357	6476 bytes
`font_01_sfnt_off00006941.bin` `5ad067d145f3d95090d2f77c80421ca174ea97e94c56edc9ef0d879d7d890b5e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6941	5188 bytes
`font_02_sfnt_off00007ac3.bin` `7b6a591037920bbd5b0334d973692288d3e91ce6064b3e8e4f4f89edccc56eb3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7AC3	10280 bytes

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